I've got an almost unmodified 1989 Jeep Wrangler YJ (2.5L engine).
I'm in NJ, and winter is coming.... I have the stock heat, and a soft top, and can get by with that. I have used a very small 12V supplementary heater in the past that plugs into the lighter socket.
If I want to run accessories off the lighter socket and an additional heater, how much power can I safely draw through the lighter socket for 12V appliances, or how much can I safely use through the lighter socket using a voltage inverter which uses a household electrical plug for power? I definitely don't want to risk wrecking the electrical system.